I just got a piece of sigma 30mm f1.4 lens.
I noticed something about this lens is when shooting at f1.4 for objects at infinity, it is REALLY hard to get consistent good focus using the AF on my E330.
The lens is very sharp at f1.4 WHEN you have a perfect focus but most of the time, it misses focus.
For nearer objects the focusing seems to be more accurate. I searched the net and found that this seems to be a common issue for the lens.
Should I bring it down to sigma and see if they can get it fixed? Other than the missed focus at infinity, I am pretty happy with this lens as it is really sharp. I don't want the sigma singapore to mess it and ended with a worse lens if this problem can't be fixed. Especially I seldom shoot at f1.4 for objects at infinity...